An optical element includes a first condensing lens and a plurality of second condensing lenses. The optical element is disposed so as to face an end of an optical fiber. The optical fiber includes a core, a first cladding located around the core, and a second cladding located around the first cladding. The first condensing lens is disposed at a position corresponding to the core. The second condensing lenses are disposed around the first condensing lens at positions corresponding to the first cladding.
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May 20, 2020
March 19, 2024
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